NGK 4642 Spark Plug

NGK Laser Platinum Spark Plug 4642

NGK Laser Platinum Spark Plug 4642 is an OE-style ignition component built for stable spark delivery and consistent engine performance. It uses a platinum center electrode, nickel ground electrode, and a 0.044 in. pre-gap to match the requirements of many Mitsubishi and Suzuki applications.

The Laser Platinum line is positioned for drivers who want a direct replacement spark plug with OE-focused construction and broad vehicle coverage. Part number PFR5J-11 is used across multiple Mitsubishi Lancer, Eclipse, Galant, Mirage, Montero, and Montero Sport applications, as well as select Suzuki Grand Vitara, Vitara, and XL-7 models.

Key Features

• NGK Laser Platinum Spark Plug, part number 4642 / PFR5J-11
• Platinum center electrode tip for durable ignition performance
• Nickel ground electrode with standard tip and standard configuration
• 0.044 in. pre-gap for listed vehicle applications
• 14 mm thread diameter, 0.75 in. reach, flat seat
• 5/8 in. hex size with non-removable nut terminal
• 5000 ohm resistance for ignition system compatibility
• Fits many Mitsubishi and Suzuki models, plus Chevrolet Tracker applications

Detailed Description

NGK 4642 is a Laser Platinum spark plug engineered around OE-equivalent specifications, including a copper core center electrode and platinum tip material for the firing end. The 5 heat range, 0.044 in. gap, and flat seat design align with the factory-style requirements listed for covered vehicles. This spark plug is a direct service part for drivers maintaining Mitsubishi Eclipse, Mitsubishi Galant, Mitsubishi Montero Sport, and related platforms, along with select Suzuki Grand Vitara and Vitara models.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from aging ignition components
• Service replacement needs on Mitsubishi and Suzuki engines

Installation Notes and Tips

Verify the listed application before installation and confirm the plug gap matches the vehicle specification. Use the correct 5/8 in. spark plug socket, thread the plug by hand first, and tighten to the vehicle manufacturer’s torque specification. For best results, replace plugs on a cold engine and inspect ignition wires or coils during service.

Fits 2002-2007 Mitsubishi Lancer, N/A; Fits 1996-2005 Mitsubishi Eclipse, N/A; Fits 1997-2004 Mitsubishi Diamante, N/A; Fits 2003-2004 Mitsubishi Montero Sport, N/A; Fits 2001-2003 Chevrolet Tracker, N/A; Fits 1992-2003 Mitsubishi Galant, N/A; Fits 2003 Mitsubishi Outlander, N/A; Fits 1993-2002 Mitsubishi Mirage, N/A; Fits 1997-2002 Mitsubishi Montero, N/A; Fits 1999-2002 Mitsubishi Montero Sport, N/A; Fits 1997-2002 Mitsubishi Montero Sport, N/A; Fits 2000-2002 Suzuki Grand Vitara, N/A; Fits 2000-2002 Suzuki Vitara, N/A; Fits 2002 Suzuki XL-7, N/A; Fits 1994-1996 Mitsubishi Montero, N/A; Fits 1993-1995 Mitsubishi Expo, N/A; Fits 1992-1994 Mitsubishi Expo LRV, N/A.

Quality Assurance

NGK is a long-established OE supplier with extensive North American coverage for domestic and import ignition applications. The brand’s manufacturing and distribution network supports consistent product standards for service replacement use.